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CentOS 7.0 - man page for cgerq2 (centos section 3)

cgerq2.f(3)				      LAPACK				      cgerq2.f(3)

NAME
       cgerq2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine cgerq2 (M, N, A, LDA, TAU, WORK, INFO)
	   CGERQ2 computes the RQ factorization of a general rectangular matrix using an
	   unblocked algorithm.

Function/Subroutine Documentation
   subroutine cgerq2 (integerM, integerN, complex, dimension( lda, * )A, integerLDA, complex,
       dimension( * )TAU, complex, dimension( * )WORK, integerINFO)
       CGERQ2 computes the RQ factorization of a general rectangular matrix using an unblocked
       algorithm.

       Purpose:

	    CGERQ2 computes an RQ factorization of a complex m by n matrix A:
	    A = R * Q.

       Parameters:
	   M

		     M is INTEGER
		     The number of rows of the matrix A.  M >= 0.

	   N

		     N is INTEGER
		     The number of columns of the matrix A.  N >= 0.

	   A

		     A is COMPLEX array, dimension (LDA,N)
		     On entry, the m by n matrix A.
		     On exit, if m <= n, the upper triangle of the subarray
		     A(1:m,n-m+1:n) contains the m by m upper triangular matrix R;
		     if m >= n, the elements on and above the (m-n)-th subdiagonal
		     contain the m by n upper trapezoidal matrix R; the remaining
		     elements, with the array TAU, represent the unitary matrix
		     Q as a product of elementary reflectors (see Further
		     Details).

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A.  LDA >= max(1,M).

	   TAU

		     TAU is COMPLEX array, dimension (min(M,N))
		     The scalar factors of the elementary reflectors (see Further
		     Details).

	   WORK

		     WORK is COMPLEX array, dimension (M)

	   INFO

		     INFO is INTEGER
		     = 0: successful exit
		     < 0: if INFO = -i, the i-th argument had an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Further Details:

	     The matrix Q is represented as a product of elementary reflectors

		Q = H(1)**H H(2)**H . . . H(k)**H, where k = min(m,n).

	     Each H(i) has the form

		H(i) = I - tau * v * v**H

	     where tau is a complex scalar, and v is a complex vector with
	     v(n-k+i+1:n) = 0 and v(n-k+i) = 1; conjg(v(1:n-k+i-1)) is stored on
	     exit in A(m-k+i,1:n-k+i-1), and tau in TAU(i).

       Definition at line 124 of file cgerq2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      cgerq2.f(3)


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